Add SESSION_CLASS option to project settings

[lrcouto]

Description

#5358

Implements the possibility of choosing a a class to handle Kedro sessions through the settings.py file in the Kedro project.

# Class that manages the KedroSession.
from {__name__} import MyKedroSession
SESSION_CLASS = MyKedroSession

Done in preparation to the future implementation of a KedroServiceSession, so it can be switched depending on user's purpose for the project.

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Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[ankatiyar]

Actually, could we separate out an AbstractSession class which the SESSION_CLASS (and KedroSession) should be based on? Otherwise we would have to update it again, for now the AbstractSession can be barebones